The Scots never recovered from having to play nearly an hour a man down after fullback Stuart Hogg was sent off for a late tackle on Wales five-eighth Dan Biggar.

The visitors, seeking a first win in Cardiff in 12 years, took an early lead but from then on it was one-way traffic as Wales, unable to win a third successive title following last week's 29-18 defeat by England, took complete control of their final match of the 2014 Championship.